Well, it's powerful stuff and I dilute down to a 10% solution before use and even then 1% of my diluted mix is on the high side. (I do go higher at times, but not often.)
It has plenty of carbon atoms in the molecule, so it can lead to coil gunking.
The studies I've read on it have countering conclusion studies, so I've never had a good reason to classify it as good or bad. I suppose it's like most things, it has folks who rail against it and those who don't see what the fuss is about.
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